The voices are part of the ambient sub sound file, which is quite long. I'll be making a sound mod, keeping most of that background, but cutting all voices out, in addition to other sounds from several other mods...
For now though, we've hit another brick wall here ArditoCorsaro. Neither patching in an old US_NavalBases file, nor editing in the old lines has worked just yet. I'm going back through my editing to make sure I didn't miss one or two, but this is strange. We had bases fine in last beta, and in the last "mix" before it went into the cauldron for release, so either I left the campaign on simmer too long, or something...
In order to avoid your untimely demise, don't go on campaigns just yet, since something like this can't be fixed mid-campaign anyway... Thankfully, there are all sorts of masterful cdrsubron7 Single Missions to enjoy...